联合空间与角度的符号相干系数平面波成像

Plane wave imaging by combining spatial and angular sign coherence coefficients

超声平面波成像是近年来一种应用较广泛的超快速超声成像方法,多角度相干平面波复合(Coherent Plane Wave Compounding,CPWC)成像在不过多损失速率的情况下,提升成像质量。但普通的CPWC方法只是简单复合多个角度延时叠加(Delay and Sum,DAS)后的数据,并未考虑到单个角度内以及多个角度之间数据的相关性。文章提出了一种联合空间与角度的符号相干系数(Angular Spatial Sign Coherence Factor,asSCF)平面波成像方法,将空间符号相干因子和角度符号相干因子创新性地融合到波束合成的过程中,充分考虑信号之间的相关性,旨在提升多角度复合成像质量。进行了仿真实验、仿体实验以及在体组织实验,对asSCF-CPWC方法、单一的符号相干系数法以及传统CPWC方法成像进行对比,结果发现asSCF-CPWC方法具有更好的横向分辨能力和成像对比度。

Ultrasonic plane wave imaging is a widely used ultra-fast ultrasonic imaging method in recent years.The composite multi-angle plane wave imaging improves the imaging quality under the condition of slight loss rate.However,the common multi-angle coherent plane wave compounding(CPWC)method simply compounds data after delay and sum(DAS)of multiple angles,without considering the correlations of the data in a single angle and between multiple angles.In this paper,a plane wave imaging method combining spatial and angular sign coherence factors(asSCF)is proposed.The spatial sign coherence factor and the angular sign coherence factor are integrated into the beamforming process,and the correlation between signals is fully considered in order to improve the quality of multiangle composite imaging.The simulation experiment,imitation experiments and in vivo tissue experiment are carried out to compare the imaging effects of asSCF-CPWC method with the single sign coherence factor method and the traditional CPWC method.The results show that the asSCF-CPWC method has better lateral resolution and better imaging contrast.